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Measure content performance. Develop and improve products. List of Partners vendors. Share Flipboard Email. Anne Marie Helmenstine, Ph. Chemistry Expert.
Helmenstine holds a Ph. She has taught science courses at the high school, college, and graduate levels. Facebook Facebook Twitter Twitter. Updated February 06, Key Takeaways: Hydrogen Bonds A hydrogen bond is an attraction between two atoms that already participate in other chemical bonds.
One of the atoms is hydrogen, while the other may be any electronegative atom, such as oxygen, chlorine, or fluorine. Hydrogen bonds may form between atoms within a molecule or between two separate molecules. A hydrogen bond is weaker than an ionic bond or a covalent bond, but stronger than van der Waals forces. Hydrogen bonds play an important role in biochemistry and produce many of the unique properties of water.
Cite this Article Format. Helmenstine, Anne Marie, Ph. Although an organic molecule is not required for hydrogen bonding, the phenomenon is extremely important in biological systems. Examples of hydrogen bonding include:. Hydrogen bonds account for some important qualities of water. There are many important consequences of the effects of hydrogen bonding between water molecules:.
Hydrogen bonding is most significant between hydrogen and highly electronegative atoms. The length of the chemical bond depends upon its strength, pressure, and temperature.
The bond angle depends on the specific chemical species involved in the bond. Larson, J. Inorganic Chemistry 23 14 : — Emsley, J. Chemical Society Reviews 9 1 : 91— Omer Markovitch and Noam Agmon A 12 : — Actively scan device characteristics for identification. Use precise geolocation data. Select personalised content.
Create a personalised content profile. Measure ad performance. It allows something called complementarybase pairing. You see, cytosine can form three hydrogenbondswith guanine, and adenine can form two hydrogen bondswith thymine. Firdaus Teixidor Explainer. How many base pairs are in DNA? Lonnie Bonias Explainer. What holds the nitrogen bases together in DNA? Strands of DNA are made of the sugar andphosphateportions of the nucleotides, while the middle parts aremade of thenitrogenous bases.
The nitrogenous bases on the twostrands of DNA pair up, purine with pyrimidine Awith T, Gwith C , and are held together by weakhydrogenbonds. Marko Lazaro Carrasco Explainer. How do the 4 bases of DNA pair up? The hydrogen bonding betweencomplementary bases holds the two strands of DNA together. Hydrogenbonds are not chemical bonds. Chastity Erzilla Pundit. What type of bonds connect the Deoxyribose? Strong covalent bonds form between the phosphategroupand two 5-carbon ring carbohydrates pentoses over twoester bonds.
Sven Beveridge Pundit. What are the two purines in DNA? There are many naturally occurring purines. Theyinclude the nucleobases adenine 2 and guanine 3. In DNA ,these bases form hydrogen bonds with theircomplementarypyrimidines, thymine and cytosine,respectively.
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